[(4R)-2-oxa-8-azaspiro[4.5]decan-4-yl] (1S,4R)-4,7,7-trimethyl-3-oxo-2-oxabicyclo[2.2.1]heptane-1-carboxylate 、
(2R,3R,4R)-2-[(1R)-1-(3,5-bis(trifluoromethyl)phenyl)ethoxy]-3-(3-bromo-4-fluorophenyl)-tetrahydropyran-4-carbaldehyde 在
三乙酰氧基硼氢化钠 、
三乙胺 作用下,
以
1,1-二氯乙烷 为溶剂,
反应 0.5h,
以83%的产率得到(1S,4R)-4,7,7-trimethyl-3-oxo-2-oxa-bicyclo[2.2.1]heptane-1-carboxylic acid-(4R)-8-{(2R,3R,4R)-2-[(1R)-1-(3,5-bis(trifluoromethyl)phenyl)ethoxy]-3-(3-bromo-4-fluorophenyl)-tetrahydropyran-4-ylmethyl}-2-oxa-8-aza-spiro[4.5]dec-4-yl ester